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t in (-oo:+oo)
t*((5*t^2-(30*t))/5) = 0
t*((5*t^2-30*t)/5) = 0
(t*(5*t^2-30*t))/5 = 0
5*t^2-30*t = 0
5*t*(t-6) = 0
t-6 = 0 // + 6
t = 6
5*t*(t-6) = 0
(5*t*t*(t-6))/5 = 0
( 5*t )
5*t = 0 // : 5
t = 0
( t-6 )
t-6 = 0 // + 6
t = 6
( t )
t = 0
t in { 0, 6, 0 }
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